readme

run a bunch of express js hello world programs in docker containers

bash  run.sh

Dockerfile

FROM node:latest
WORKDIR /app
COPY . .
RUN yarn
CMD ["node", "index.js"]

index.js

const express = require('express')
const app = express()
const port = process.env.PORT

app.get('/', (req, res) => {
    res.send(`Hello World from port ${port}!`)
})

app.listen(port, () => {
    console.log(`Example app listening at http://localhost:${port}`)
})

package.json

{
  "name": "express",
  "version": "1.0.0",
  "main": "index.js",
  "license": "MIT",
  "dependencies": {
    "express": "^4.17.1"
  }
}

run.sh

#!/usr/bin/env bash

docker build -t helloworld .

for i in {3000..3200}; do
  docker run -d --env PORT=$i -p $i:$i helloworld;
done